18912004 has 6 divisors (see below), whose sum is σ = 33096014. Its totient is φ = 9456000.

The previous prime is 18911999. The next prime is 18912053. The reversal of 18912004 is 40021981.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15225604 + 3686400 = 3902^2 + 1920^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18912004.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2363997 + ... + 2364004.

Almost surely, 2^18912004 is an apocalyptic number.

It is an amenable number.

18912004 is a deficient number, since it is larger than the sum of its proper divisors (14184010).

18912004 is a wasteful number, since it uses less digits than its factorization.

18912004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4728005 (or 4728003 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 18912004 is about 4348.7933958743. The cubic root of 18912004 is about 266.4275822367.

Adding to 18912004 its reverse (40021981), we get a palindrome (58933985).

The spelling of 18912004 in words is "eighteen million, nine hundred twelve thousand, four".